NM ↔ SM ↔ KM Converter
Convert between nautical miles, statute miles, and kilometers. Nautical miles are the standard for aviation distance, while visibility is reported in statute miles.
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Formula
1 NM = 1.15078 SM = 1.852 km
One nautical mile equals one minute of latitude (1/60th of a degree). Multiply NM by 1.15078 for SM, or by 1.852 for km.
Reference Table
| NM | SM | KM | Context |
|---|---|---|---|
| 3 | 3.45 | 5.56 | VFR visibility minimum (controlled) |
| 5 | 5.75 | 9.26 | Class B/C transition distance |
| 10 | 11.5 | 18.5 | Short cross-country leg |
| 50 | 57.5 | 92.6 | Minimum solo XC leg (FAR 61.93) |
| 100 | 115 | 185 | Typical XC training flight |
Aviation Context
Aviation charts use nautical miles for distance and groundspeed, while visibility in METARs and TAFs is in statute miles. Understanding this distinction prevents planning errors. Sectional chart scale is 1:500,000, and VFR cruising altitudes are based on magnetic course direction.
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